http://www.zive.cz/clanky/zrychleni-pocitace-flash -diskem-windows-readyboost-v-praxi/co-je-readyboos t-a-na-cem-funguje/sc-3-a-134181-ch-52200/default. aspx
A toto praví Wikipedia:

A system with 512 MB of RAM (the minimum requirement for Windows Vista) can see significant gains from ReadyBoost.[14][15] In one test case, ReadyBoost speeds up an operation from 11.7 seconds to 2 seconds (conversely, increasing physical memory from 512 MB to 1 GB without ReadyBoost reduced it to 0.8 seconds).